Sam's Club offers its members the Hitachi 43" 4K 2160p LED-Backlit LCD Ultra HD Television, model no. LU43V809, for $298.86 with free shipping. (Non-members must pay $29.89 more.) That's tied with last month's mention and the lowest total price we've seen. (It's a current best by $17, excluding the mention below.) It features a native resolution of 3840x2160 (2160p), USB, and four HDMI inputs.
A close price: Newegg has it for $299.99 with free shipping.